Improved mode of forming- insulators



JAMES 1u. BROOKFIELD, OF BROOKLYN, NEW YORK.

Letters Patent No. 103,555, dated May 31, 1870. l

IMPROVE!) MODE OF FORMING- INSULATORS.

The E ehedulel xelarre'd to in these Letters Pasen: and making part 0f the Bam@- T0 u Wham NM1-y 00'10"?" `as those'on the former, and so arranged, relativelyto .Be itknown that I,L JAMES M. B uoOKFmLD, of l3rooklyn, Kings county, andState of 'New York, have invented a new and improved Mode of Forming Glass Insulators; and I do hereby declare that the following. is a full, c ear, and exact description thereof, which will enable others skilled n the art to make and use the same, reference heilig had to the accompanying drawing forming part of this specification.

. My invention relates to glass insulators, and conlsists in an article of improved form, and also in cer-` tain improvements in machinery by which the article is made, as will be specified more particularly hereinafter:

. The inv'entiou also comprises the combina-lion' with the former of a follower, for pressing down into the top of the mold, to prevent the overflow of the glass,

and to give form to the bottom 'of the insulator.

Figure 1 represent-s a front elevation, partly in seption, of a machine, showing one arrangementot' means for Operating the former;

Figure 2 is a side elevation o f the same; Figure 3 is a section through the mold and follower,

showing the former when screwed into the glass;

and

.Figure 4 is a plan view of thel nioldsnsed for giving the exterior shape to' the insulators and holding the glass while the action of the former is taking place.

Similar letters of reference' indicate corresponding parts.

These glass insulators are now formed, in respect to their exterior shape, and with smooth sockets, by

plaeingthe molten glass iii the two-part hinged asks or molds A, and forcing a smooth former into the' molten glass from the top, the said molds being open thereat, and charged with a suieient quantity for one.

. insulator by pouring it iu'at the said opening.

I now propose to formthe screw-threads by which the insulators are screwed-onto the supporting studs,

' at thesame time the exterior shapeis produced and the .socket formed, by means of ascrew-threaded-mandrei,

Ihm-ranged in'a suitable screwethreaded support, C,4

`and with suitablemeans for screwing it down into and onto'the glass, while inthe mold'andunder the former, either wholly forming the socket bythe screw-threaded former, .or first partially forming the same by a smoothA former or plunger, pressed into the glass, and to this end I provide a tabled), for the mold A, a support,

0for the former, with screw-threadsof'the same pitch the table, that the mold may be placed under it, to rcceive it in the center of the glass, while the latter is in a plastic state.

The follower is allowed to remain until the glass solidifies, and is then withdrawn.

I also provide, as one means of turning the former, a crank, E, on the top of the shaft of the former, or in another arrangement I place a bevel-wheel on the said shaft, and gear wit-h it another and larger bcvclwheel, on a horizontal shaft, provided with a drivingcrank.

I:` is a follower, suspended by a har, G, from the shaft of the foi-nier, at the upper end by rods I-I, capable of sliding np and down in the bar G, and having -adjustahle `nnts, I,.to limit their downward movement. They also have springs K, arranged to press the follower down.

When the former is up, the follower will be raised by the bar G and rods sufficiently to allow the molds A to be moved under the former, and, when thc latter is screwed down a short distance, the follower will assume the position on the molds represented in fi". 3,.

the follower continues to screw into it, the springs, at.

the same time, pressing down thereon, and their t'oree increasing as the follower' goes down.

L represents guides forthe follower. 'lhis prevents the glass from beingr forced over the top of the mold, and gives shape to the bottoni of the insulator. Havng'thns described myinvent-ion, l

I claim as new and desire to secure by Letters Patentl. The combination of divided die A, constructed internallyas shown in fig. 3 of drawing, with a mandrel, B, threaded on its lower en d as described, so that the insulator will be threaded in its center, while the divided die will allow of its removal, notwithstaiuling its irregular external form.

2. lhe combination of divided die A, constructed internally as described, and the Vend-threaded mandrel B,.with the follower F that presses upon the plastic glassand forms the betteln of the insulator, in t-hc manner described.

JAMES M. BROQKFIELD.

Witnesses GEO. W. Manen,

ALEX. F. Routers, 

